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20506254 = 2316192111
BaseRepresentation
bin100111000111…
…0011010001110
31102120211021220
41032032122032
520222200004
62011304210
7336204666
oct116163216
942524256
1020506254
111063671a
126a4b066
13432c9a2
142a1b1a6
151c00dd9
hex138e68e

20506254 has 16 divisors (see below), whose sum is σ = 41057280. Its totient is φ = 6827960.

The previous prime is 20506249. The next prime is 20506261. The reversal of 20506254 is 45260502.

It is a super-2 number, since 2×205062542 = 841012906225032, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8659 + ... + 10769.

It is an arithmetic number, because the mean of its divisors is an integer number (2566080).

Almost surely, 220506254 is an apocalyptic number.

20506254 is an abundant number, since it is smaller than the sum of its proper divisors (20551026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20506254 is a wasteful number, since it uses less digits than its factorization.

20506254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3735.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20506254 is about 4528.3831551670. The cubic root of 20506254 is about 273.7130122458.

Adding to 20506254 its reverse (45260502), we get a palindrome (65766756).

The spelling of 20506254 in words is "twenty million, five hundred six thousand, two hundred fifty-four".

Divisors: 1 2 3 6 1619 2111 3238 4222 4857 6333 9714 12666 3417709 6835418 10253127 20506254